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80386 - Intel
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Intel 80386
KL Intel i386DX.jpg
Intel A80386DX-16 ΣΣ
Developer Intel
Manufacturer Intel
Type Microprocessors
Introduction June 1984 (announced)
October 1985 (launch)
Production 1985-2008
Architecture x86
ISA IA-32
µarch 80386
Word size 32 bit
4 octets
8 nibbles
Process 1.5 µm
1,500 nm
0.0015 mm
, 1 µm
1,000 nm
0.001 mm
Technology CMOS
Clock 12 MHz-33 MHz
Package PGA-132, PQFP-132
Succession
80286 80486

The 80386, also i386 and 386, (pronounced eighty-three-eighty-six) was a family of 32-bit 3rd-generation x86 microprocessors introduced by Intel in 1985 as a successor to 80286. These processors provided were fully backwards compatible with previous generations of x86 processors but introduced a number of major new features including enhancements to protected mode and virtual 8086 mode. The changes brought about by 386 became the standard for all future 32-bit x86 processors, dubbed i386-architecture.

History[edit]

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Architecture[edit]

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Members[edit]

Single-word eXternal[edit]

Model Introduction Ext. Bus Frequency Notes
80386SX-16 June 16, 1988 16-bit 16 MHz
80386SX-20 January 25, 1989 16-bit 20 MHz
80386SX-25 January 25, 1989 16-bit 25 MHz
80386SX-33 October 26, 1992 16-bit 33 MHz
80386SL-20 October 15, 1990 16-bit 33 MHz
80386SL-25 September 30, 1991 16-bit 33 MHz

Double-word eXternal[edit]

Model Introduction Ext. Bus Frequency Notes
80386-12 October 17, 1985 32-bit 12 MHz Renamed with "DX" suffix upon the introduction of the "SX" version.
80386-16 December, 1985 32-bit 16 MHz
80386-20 February 16, 1987 32-bit 20 MHz
80386DX-16 1988 32-bit 16 MHz
80386DX-20 1988 32-bit 20 MHz
80386DX-25 April 4, 1988 32-bit 25 MHz
80386DX-33 April 10, 1989 32-bit 33 MHz
80386DX-16 IV 32-bit 16 MHz
80386DX-20 IV 32-bit 20 MHz
80386DX-25 IV 32-bit 25 MHz
80386DX-33 IV 32-bit 33 MHz

Suppport Chips[edit]

Part Description
A82370-16 32-bit 8-channel DMA controller @ 16 MB/sec
82380-16 32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 16 MHz
82380-20 32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 20 MHz
82380-25 32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 25 MHz
82384-16 Clock generator @ 16 MHz
82384-20 Clock generator @ 20 MHz
82385 Cache Controller

Clones[edit]

This list is incomplete; you can help by expanding it.

Documents[edit]

Manual[edit]

Others[edit]

Facts about "80386 - Intel"
designerIntel +
first announcedJune 1984 +
first launchedOctober 1985 +
full page nameintel/80386 +
instance ofmicroprocessor family +
instruction set architectureIA-32 +
manufacturerIntel +
microarchitecture80386 +
packagePGA-132 + and PQFP-132 +
process1,500 nm (1.5 μm, 0.0015 mm) + and 1,000 nm (1 μm, 0.001 mm) +
technologyCMOS +
word size32 bit (4 octets, 8 nibbles) +